package fourteen;


import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("./a/win10.jpg");
        FileOutputStream fos = new FileOutputStream("./a/win10_cp.jpg");
        long start = System.currentTimeMillis();
        byte[] data = new byte[1024*10];//每次读取10kb
        int len;
        while((len=fis.read(data))!=-1){
            //将字节数组byte从下标0开始连续len个字节写出(做到读多少就写多少)
            fos.write(data,0,len);
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完毕，耗时："+(end-start)+"ms");

        fis.close();
        fos.close();
    }

}
